Radio receiving system



Aug. 7, 1934. F, ECKER 1,969,599

RADIO RECEIVING SYSTEM Filed Aug; 25, 1952 Patented Aug. 7, 1934 UNITED STATES PATENT OFFICE 1 Claim.

My invention is directed to a circuit arrangement and apparatus for use therewith for improving the operation of radio receiving apparatus.

One of the objects of my invention is to provide a simplified construction of attachment for use in radio receiving systems which includes a multiplicity of plate members constituted by iron having a coating of tin thereon where the plate members are insulated one from another and disposed in a stack, alternate plate members constituting separate groups with an antenna terminal connected to one group of plate members and a ground terminal connected to the other group of plate members.

My invention will be more fully understood from the specification hereinafter following by reference to the accompanying drawing, in which:

Figure 1 illustrates a receiving circuit, showing the connections therein of the device of my invention; Fig. 2 is a plan View of the device of my invention showing the plate formation thereof and the positive and negative terminals provided for the connection of the antenna and ground in the radio receiving system to the device; Fig. 3 is a side elevation of the device of my invention; Fig. 4 is a schematic View of the device illustrated in Figs. 1, 2 and 3, showing more clearly the arrangement of the insulation between the plate members; and Fig. 5 is an enlarged sectional view illustrating the arrangement of the plate members disposed in a stack with sheets of insulation arranged therebetween.

Referring to the drawing in detail I have illustrated my invention applied to a radio receiving set having an antenna 9 and a ground connection 8 and an input radio frequency transformer system designated at l0. The primary winding 11 is connected with the antenna 9 and ground 8 and is inductively related to the secondary winding 12 which connects to the input of the first stage of radio frequency amplification which includes the electron tube shown at 14. The output circuit of the radio frequency amplifier tube 14 is connected with the radio frequency transformer 15, the secondary winding of which has terminals 16 extending to a subsequent amplier stage or to the detector. The device of my invention is shown at l connected in parallel with the antenna ground circuit and in parallel with the input of the radio receiving system. I have shown the positive terminal 4 of the device of my invention connected through positive lead 6 with the ground terminal 8. I have shown the negative terminal 5 of the device of my invention connected through negative lead 7 to the antenna 9.

(Cl. Z50-20) Referring more particularly to Figs. 2, 3, 4 and 5 the device of my invention as shown at 1, comprises a multiplicity of plate members. Each plate member is constituted by a base of iron and over the base material I provide a coating of tin. 'lhis coating may be deposited by a dipping operation. The plate members are arranged alternately in two groups with sheets cf insulation as illustrated at 17, in Fig. 5, therebetween. The plate members constituting one group project beyond the ends of the alternate plate members constituting the other group in the position illustrated at 19 in Fig. 4. The ends of the plate members constituting the other alternate group project beyond the ends of the plate members of the first mentioned alternate group in the position shown at 20 in Fig. 4. The conductive coating of tin on each of the projecting surfaces of the plate members are clamped by means of terminal members and pro'- vide parallel solid connections as illustrated at 2 and 3. In order to provide for the proper support o-f the several plates of the device, I provide an upper insulation sheet 23 and a lower insulation sheet 24, which are clamped to each of the terminals 4 and 5 and provide mounting means for the several plates. In order to make the construction clear, I have designated in Fig. 5, the alternate plates which connect with the terminals 21 and 22. By the use of my device in a radios receiving set the length of the antenna may be much shortened.

I have found the device of my invention highly practical in operation. By connecting the radio device of my invention with a broadcast receiver the response of the receiver to static disturbances has been substantially reduced.

While I have described by invention in one of its preferred embodiments I desire that it be understood that modifications may be made and that no limitations upon my invention are intended other than are imposed by the scope of the appended claim.

What I claim as new and desire to secure by Letters Patent of the United States is as follows:

In a static reducing device, means connected with an antenna ground system comprising a multiplicity of plate members, each being formed from sheet iron and each coated with tin on the surfaces thereof, said plate members being disposed in a stack and insulated one from another with an antenna terminal connected to one alternate set of plate members and a ground terminal connected to another alternate set of plate members, and a signal receiving circuit connected with said terminals.

FRANK ECKER. 

